Human skin colour is the example of
I.multiple gene inheritance.
II. Three or more genes controlling this trait.
III. single gene controlling this trait.
IV. Two gene controlling this trait.
V. environment plays a significant role in this trait.
Choose the correct option.

Options

A. I,II and III
B. II, III and IV
C. III , IV and V
D. I, II and V

Answer

To solve the question regarding human skin color and its inheritance, we need to analyze the options provided and understand the concepts of genetics involved. Here’s a step-by-step breakdown of the solution:

### Step 1: Understanding Human Skin Color Inheritance
Human skin color is a complex trait influenced by multiple genetic factors and environmental conditions. It is not determined by a single gene or just two genes.

### Step 2: Identifying Multiple Gene Inheritance
Multiple gene inheritance, also known as polygenic inheritance, means that more than one gene contributes to a single trait. In the case of human skin color, it is controlled by several genes, which is why there is a wide range of skin tones.

### Step 3: Evaluating the Options
1. **Multiple Gene Inheritance**: This is true as skin color is influenced by multiple genes.
2. **Three or More Genes Controlling This Trait**: This is also true since research indicates that more than three genes can influence skin color.
3. **Single Gene Controlling This Trait**: This is false. Skin color is not controlled by a single gene.
4. **Two Genes Controlling This Trait**: This is also false. Skin color is influenced by more than two genes.
5. **Environment Plays a Significant Role in This Trait**: This is true. Environmental factors, such as UV exposure, affect melanin production and thus skin color.

### Step 4: Conclusion
Based on the evaluation:
- Options 1 (multiple gene inheritance), 2 (three or more genes controlling this trait), and 5 (environment plays a significant role) are correct.
- Options 3 and 4 are incorrect.

Thus, the correct answer is that human skin color is an example of multiple gene inheritance, with three or more genes controlling this trait, and the environment also playing a significant role.

### Final Answer
The correct options are: I, II, and V.